const CryptoJS = require("crypto-js");



function Base64 () {
  _keyStr = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=";
  this.encode = function (e) {
    var t = "", n, r, i, s, o, u, a, f = 0;
    e = _utf8_encode(e);
    while (f < e.length) {
      n = e.charCodeAt(f++);
      r = e.charCodeAt(f++);
      i = e.charCodeAt(f++);
      s = n >> 2;
      o = (n & 3) << 4 | r >> 4;
      u = (r & 15) << 2 | i >> 6;
      a = i & 63;
      isNaN(r) ? u = a = 64 : isNaN(i) && (a = 64);
      t = t + _keyStr.charAt(s) + _keyStr.charAt(o) + _keyStr.charAt(u) + _keyStr.charAt(a)
    }
    return t
  }
    ;
  this.decode = function (e) {
    var t = "", n, r, i, s, o, u, a, f = 0;
    e = e.replace(/[^A-Za-z0-9\+\/\=]/g, "");
    while (f < e.length) {
      s = _keyStr.indexOf(e.charAt(f++));
      o = _keyStr.indexOf(e.charAt(f++));
      u = _keyStr.indexOf(e.charAt(f++));
      a = _keyStr.indexOf(e.charAt(f++));
      n = s << 2 | o >> 4;
      r = (o & 15) << 4 | u >> 2;
      i = (u & 3) << 6 | a;
      t += String.fromCharCode(n);
      u != 64 && (t += String.fromCharCode(r));
      a != 64 && (t += String.fromCharCode(i))
    }
    t = _utf8_decode(t);
    return t
  }
    ;
  _utf8_encode = function (e) {
    e = e.replace(/\r\n/g, "\n");
    var t = "";
    for (var n = 0; n < e.length; n++) {
      var r = e.charCodeAt(n);
      if (r < 128)
        t += String.fromCharCode(r);
      else if (r > 127 && r < 2048) {
        t += String.fromCharCode(r >> 6 | 192);
        t += String.fromCharCode(r & 63 | 128)
      } else {
        t += String.fromCharCode(r >> 12 | 224);
        t += String.fromCharCode(r >> 6 & 63 | 128);
        t += String.fromCharCode(r & 63 | 128)
      }
    }
    return t
  }
    ;
  _utf8_decode = function (e) {
    var t = ""
      , n = 0
      , r = c1 = c2 = 0;
    while (n < e.length) {
      r = e.charCodeAt(n);
      if (r < 128) {
        t += String.fromCharCode(r);
        n++
      } else if (r > 191 && r < 224) {
        c2 = e.charCodeAt(n + 1);
        t += String.fromCharCode((r & 31) << 6 | c2 & 63);
        n += 2
      } else {
        c2 = e.charCodeAt(n + 1);
        c3 = e.charCodeAt(n + 2);
        t += String.fromCharCode((r & 15) << 12 | (c2 & 63) << 6 | c3 & 63);
        n += 3
      }
    }
    return t
  }
}

function secretMethod (phone) {
  var t = new Base64
    , n = CryptoJS.MD5(phone).toString()
    , e = t.encode(phone);
  return t.encode(n.substr(0, 8) + e + n.substr(10, 4))
}




console.log(secretMethod('15288888888'));

